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000460300 1001_ $$0P:(DE-H253)PIP1010796$$aCicoli, Michele$$b0
000460300 245__ $$aOn the choice of entropy variables in multifield inflation
000460300 260__ $$c2021
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000460300 520__ $$aWe discuss the usefulness and theoretical consistency of different entropy variables used in the literature to describe isocurvature perturbations in multifield inflationary models with a generic curved field space. We clarify which is the proper entropy variable to be used to match the evolution of isocurvature modes during inflation to the one after the reheating epoch in order to compare with observational constraints. In particular, we find that commonly used variables, as the relative entropy perturbation or the one associated to the decomposition in tangent and normal perturbations with respect to the inflationary trajectory, even if more useful to perform numerical studies, can lead to results which are wrong by several orders of magnitude, or even to apparent destabilisation effects which are unphysical for cases with light kinetically coupled spectator fields.
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000460300 650_7 $$2INSPIRE$$aentropy, perturbation
000460300 650_7 $$2INSPIRE$$ainflation, model
000460300 650_7 $$2INSPIRE$$aisocurvature, perturbation
000460300 650_7 $$2INSPIRE$$atrajectory
000460300 650_7 $$2INSPIRE$$areheating
000460300 650_7 $$2INSPIRE$$aspectator
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000460300 7001_ $$0P:(DE-H253)PIP1087239$$aGuidetti, Veronica$$b1$$eCorresponding author
000460300 7001_ $$0P:(DE-HGF)0$$aMuia, Francesco$$b2
000460300 7001_ $$0P:(DE-H253)PIP1018307$$aPedro, Francisco$$b3
000460300 7001_ $$0P:(DE-HGF)0$$aPaolo, Vacca Gian$$b4
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